[BUGFIX] Avoid formatting typo in docs

A missing whitespace makes a code block
being eaten away by doc rendering.

Resolves: #104169
Related: #104153
Releases: main
Change-Id: I0f9516c6de08c3b1625582debc3c65120ea5fe03
Reviewed-on: https://review.typo3.org/c/Packages/TYPO3.CMS/+/84815


Tested-by: Christian Kuhn <lolli@schwarzbu.ch>
Tested-by: core-ci <typo3@b13.com>
Reviewed-by: Christian Kuhn <lolli@schwarzbu.ch>